This commit backports revisions 00938b2b228f3b70d3d9e51f29a1505bdad43f1e and
59f90a338bce2376b540ee239cf4e269bf6d68ad from googletest's master branch to
our included version of googletest, which is based on 1.8.1. It adds the
GTEST_SKIP feature, which is very useful for a project like FreeBSD where
some tests depend on particular system configurations.
Obtained from: github.com/google/googletest
Sponsored by: The FreeBSD Foundation
In order to compile these tests with different CXXFLAGS, I needed to copy them
to different filenames to trick the compiler. Unfortunately, this triggers a
failure with one of the tests as it hardcodes the path to the test, instead of
relying on the compiler to fill in the path via `__FILE__`.
Using `__FILE__` is standard and works. Rely on it instead of a hardcoded path.
